/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.inlong.tubemq.server.common.utils;

import java.util.Arrays;

/**
 * This class encapsulates a byte array and overrides hashCode and equals so that it's identity is
 * based on the data rather than the array instance.
 * Copied from <a href="http://hbase.apache.org">Apache HBase Project</a>
 */
public class HashedBytes {

    private final byte[] bytes;
    private final int hashCode;

    public HashedBytes(byte[] bytes) {
        this.bytes = bytes;
        hashCode = WritableComparator.hashBytes(bytes, bytes.length);
    }

    public byte[] getBytes() {
        return bytes;
    }

    @Override
    public int hashCode() {
        return hashCode;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        HashedBytes other = (HashedBytes) obj;
        return Arrays.equals(bytes, other.bytes);
    }

    @Override
    public String toString() {
        return Bytes.toStringBinary(bytes);
    }
}
